Laboratory hood



FIG. 1 is a perspective view of a laboratory hood showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a right side elevational view thereof, the left side being substantially similar in appearance;

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a laboratory hood, as shown and described. 